Direct assembly synthesis of metal complex–semiconductor hybrid photocatalysts anchored by phosphonate for highly efficient CO2 reduction

Abstract

Hybrid photocatalysts consisting of a ruthenium complex and p-type photoactive N-doped Ta(2)O(5) anchored with an organic group were successfully synthesized by a direct assembly method. The photocatalyst anchored by phosphonate exhibited excellent photoconversion activity of CO(2) to formic acid under visible-light irradiation with respect to the reaction rate and stability.

Photocatalytic conversion of CO2 into value-added and renewable fuels

“…It is recognized to be more efficient for visible light harvesting than cation doping because of the fewer recombination centers formation compared to cation doping [49][50][51][52][53][54][55][56]. Specifically, Zhao et al have prepared N-doped TiO 2 nanotubes (N-TNTs) by hydrothermal method and it is found that because of the substitution of lattice oxygen by N atoms, N-doped TiO 2 shows efficient visible light absorption, and markedly improved visible light photocatalytic activities for CO 2 reduction to yield HCOOH, HCHO, CH 3 OH, etc.…”

Visible light-sensitive mesoporous N-doped Ta2O5 spheres: synthesis and photocatalytic activity for hydrogen evolution and CO2 reduction

“…11 Preparation of fine Ta 2 O 5 (Ta 2 O 5 -fine) and fine N-doped Ta 2 O 5 (N-Ta 2 O 5 -fine) particles Ta 2 O 5 -fine was prepared using TaCl 5 and ammonia solution as previously reported. 9 N-Ta 2 O 5 -fine was prepared by annealing Ta 2 O 5 -fine under an NH 3 flow at 848 K for 6 h, according to a previously reported method.…”

Selective Formic Acid Production via CO2 Reduction with Visible Light Using a Hybrid of a Perovskite Tantalum Oxynitride and a Binuclear Ruthenium(II) Complex

“…[1][2][3][4][5][6][7][8][9][10][11][12] In recent years, the production of transportable fuels such as formic acid or methanol has attracted much attention since these chemicals can act as energy carriers of hydrogen, which outputs a high density of energy after combustion without releasing harmful products. [4][5][6][7][8][9] We have been developing CO 2 fixation systems consisting of a semiconductor and a metal complex workable under visible light. [6][7][8][9] Among the hybrid systems developed, combining Agmodified TaON with a binuclear Ru(II) complex (RuRu' in Chart 1) allows one to convert CO 2 into HCOOH according to a two-step photoexcitation mechanism, as depicted in Scheme 1.…”